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Chemistry Coursework Introduction I am investigating how the rate of reaction relates to the concentration of sodium thiosulphate when reacted with hydrochloric acid. The reaction that will take place is as follows: Na2S2O3 (aq) + HCl (aq) 2NaCl (aq) + SO2 (aq) + H2O (l) + S (s) I predict that as the concentration decreases, the time taken for the reaction to finish will increase. Using the results from other experiments I performed, I predict that mathematically if the concentration is halved, the time taken will double; therefore it is inversely proportional. I also predict that as the concentration increases (for example, doubles), the rate of reaction will increase (double) as well, making it proportional. This is the case because, as the concentration increases, the number of sodium thiosulphate particles increase. This means that the chance of successful collisions with hydrochloric acid particles is increased. Method The equipment I used was as follows: * 100cm3...

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